1. Fakulti Teknologi Kejuruteraan Mekanikal dan Pembuatan Universiti Teknikal Malaysia Melaka Durian Tunggal Melaka Malaysia
2. Department of Mathematics, Faculty of Science Universiti Putra Malaysia UPM Serdang Selangor Malaysia
3. Department of Mathematics Babeş‐Bolyai University Cluj‐Napoca Romania